it'll be interesting to see what happens if it goes to court.
On the one hand, I feel like the photographer should own the rights to the photo since he's the one that created the circumstances leading up to the photo, kind of like a photographer that sets up various camera traps that takes pictures automatically. After all, if it wasn't for the photographer, the picture wouldn't exist in the first place - but on the one hand, the monkey did press the button herself. Although legally, an animal can't own a copyright.
It does beg another question; what about those elephants in thailand that paints? Who legally owns those paintings? The elephants?
That being said, awesome monkey selfie is awesome. Taking selfies is an instinct!